No spark

2000 GMC JIMMY
163,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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WILLIE L.
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Drove vehicle to destination about 45 minutes away it ran perfect. parked then came back 4 hours later motor turns over. No spark from coil to distributor. Replaced coil and starter control module. Still no spark from coil. can only assume it's the computer gone bad?
Jul 13, 2020 at 6:17 PM
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KASEKENNY
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This could be the VCM but when you say you replaced the starter control module, I assume you mean the Ignition control module? If so, we need to make sure the crank sensor is sending signal as the VCM will pulse the EICM based on this signal. This module is pulsed, it closes the coil and this is what tells the coil to fire.

Basically crank the engine and tell me what voltage you have at each of the points on this diagram.

Let me know and we can go from there. Thanks
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Jul 13, 2020 at 6:39 PM